diff options
Diffstat (limited to 'llvm/lib/Transforms/Scalar/MergeICmps.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/MergeICmps.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Scalar/MergeICmps.cpp b/llvm/lib/Transforms/Scalar/MergeICmps.cpp index d6d79be2a8f..19d973a39ed 100644 --- a/llvm/lib/Transforms/Scalar/MergeICmps.cpp +++ b/llvm/lib/Transforms/Scalar/MergeICmps.cpp @@ -666,6 +666,9 @@ bool BCECmpChain::simplify(const TargetLibraryInfo *const TLI, if (!AtLeastOneMerged()) return false; + LLVM_DEBUG(dbgs() << "Simplifying comparison chain starting at block " + << EntryBlock_->getName() << "\n"); + // Effectively merge blocks. We go in the reverse direction from the phi block // so that the next block is always available to branch to. const auto mergeRange = [this, TLI, AA](int I, int Num, BasicBlock *Next) { @@ -676,6 +679,9 @@ bool BCECmpChain::simplify(const TargetLibraryInfo *const TLI, BasicBlock *NextCmpBlock = Phi_.getParent(); for (int I = static_cast<int>(Comparisons_.size()) - 2; I >= 0; --I) { if (IsContiguous(Comparisons_[I], Comparisons_[I + 1])) { + LLVM_DEBUG(dbgs() << "Merging block " << Comparisons_[I].BB->getName() + << " into " << Comparisons_[I + 1].BB->getName() + << "\n"); ++NumMerged; } else { NextCmpBlock = mergeRange(I + 1, NumMerged, NextCmpBlock); @@ -689,6 +695,8 @@ bool BCECmpChain::simplify(const TargetLibraryInfo *const TLI, // blocks in the old chain unreachable. while (!pred_empty(EntryBlock_)) { BasicBlock* const Pred = *pred_begin(EntryBlock_); + LLVM_DEBUG(dbgs() << "Updating jump into old chain from " << Pred->getName() + << "\n"); Pred->getTerminator()->replaceUsesOfWith(EntryBlock_, NextCmpBlock); } EntryBlock_ = nullptr; @@ -696,6 +704,7 @@ bool BCECmpChain::simplify(const TargetLibraryInfo *const TLI, // Delete merged blocks. This also removes incoming values in phi. SmallVector<BasicBlock *, 16> DeadBlocks; for (auto &Cmp : Comparisons_) { + LLVM_DEBUG(dbgs() << "Deleting merged block " << Cmp.BB->getName() << "\n"); DeadBlocks.push_back(Cmp.BB); } DeleteDeadBlocks(DeadBlocks); |
